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Pennsylvania birdlife.

APA Citation

Luttringer, L. A., Harrison, H. H. (1959). Pennsylvania birdlife. 4th rev. and enl. ed. Harrisburg: Pennsylvania Game Commission.

Luttringer, Leo A, and Hal H Harrison. Pennsylvania Birdlife. 4th rev. and enl. ed. Harrisburg: Pennsylvania Game Commission, 1959.

Warning: These citations may not always be complete (especially for serials).